experiment
EXPERIMENT :
USING R75 AND LOOP ANTENNA 1 x 1 m
1st part:
Checking loop antenna in inductive or direct connection
Date of experiment : 9/2/2k
QTH: Retziki 20N 23E Thessaloniki , reception made outdoors ( not inside the house)
An experiment with this 1 x 1 m loop antenna , with direct connexion and inductive tuned connection
The antenna was in fixed position Preamp was on ( + 10 db)
Result:
Direct connection does not offer antenna tuning operation , but shows a constant (?) gain on all the LF bands but inductive coupling can offer better signals abt 12-15 db
Legend :
QRG : frequency
Win: windings
S ; S meter with inductive coupling , properly tuned
S- direct : direct connection to receiver
S meter readings: S2/S1 = 6 db ( 4 times stronger)
Over S9 readings always per 10 db ( x 10)
PART 2
Resonance of the 1 x 1 m antenna
Mysteriously , the 1 x1m antenna shown some resonance with ONLY the wideband receiver MVT7100 by direct or by indirect (inductive coupling) but with R-75 it did not shown any resonance except what the R-75 should listen !
Direct connection with MVT 7100 :
Inductive coupling with 900 pF capacitor ( always used) and MVT7100 and 3 m double wire connection
Part 3
LOGS MADE WITH THE 1 x 1 m antenna
Date: 11-2-2k